Thanks - we used Debitoor for just invoicing who were fine - it was the integeration of the accounts and VAT that we moved to QB for about 3 years ago on accountants advice.

Since then there have been so many glitches with QB bank files, invoicing, annoying pop up messages that you have to delete every time you log in as well as having to log in frequently even with the max 3 hrs set -  and a complete lack of any real person to speak to - and no compensation for their issues.

Xero would probably be the one i will trial too. when i get some time.